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Certificate Authority Market Share Report

April 1st, 2007

Report Description

This report, much like our original
certs and CAs report, focuses on issuers of SSL enabling certificates
found on web servers. Unlike our original report, however, this report
has a couple of key differences to it:

Reports on top 100 CAs. The original report only paid attention
to the major CAs at the time the report was produced. This report lists
the top 100 CAs for the month. You will find here many self-signing
organizations such as universities, telecommunications firms, etc.

Uses issuer name as identifier. Our original report only counted
a certificate towards an organization if we were able to prove, by virtue
of verifying the key, that the organization in question actually signed the
certificate. This had a notable problem with it - we don't always have
the public key of the CA. In at least one case, a CA doesn't make their
public key available unless you sign a license agreement.

This report doesn't have that problem, since it only uses the issuer
Organization Name to uniquely identify the issuing CA.

Note: Readers are cautioned that the Growth percentages are based on
a CA's market share penetration rather than the absolute number of
certificates we detected. Thus, it is possible for the number of certificates
to increase, while the growth is actually a negative value.